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Add a dash of salt to 1 quart water in a large pasta pot.
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Bring water to a boil, add pasta and cook according to the package directions.
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Drain and set the pasta to the side.
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Slice your green onions.
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Set to the side.
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While you are cooking your pasta cook your bacon to a crisp so you can crumble.
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Use the same skillet that you cooked your bacon in add your butter.
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Melt butter on medium heat and then add your green onions and cook 2 minutes.
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Add 2 Tbsp flour and cook 1 minute.
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Add your half and half and whisk to prevent clumps.
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Add Cajun seasoning and mix to combine.
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Add your crawfish tails and shrimp and stir often for 5 minutes.
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Add cheeses and stir until melted.
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Fold pasta and half of the bacon into cheese sauce.
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Top the pasta mix with remaining bacon and bread crumbs.
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Turn your oven to broil.
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Place your pasta mix into the oven and toast for 5 minutes.
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Remove garnish with green onions slices.
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Allow to cool 5 minutes before serving.